单项选择题

The director had her assistant () some hot dogs for the staff members.

A. picked up
B. picks up
C. pick up
D. picking up

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单项选择题
It is required that such insulator (绝热体) () a heat resistant material.

A. must be made of
B. should be made of
C. will be made of
D. would be made of
单项选择题
If a metal bar is heated, the greater the heat (), the larger the expansion.

A. applied
B. being applied
C. applying
D. is applied
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